Please notice that wifi_softap_get_config(&softap_config); // Get config first is recommended to be called first.Or you have to set value for every parameter in softap_config, for example, softap_config.beacon_interval and softap_config.ssid_len, otherwise they will be random value which may make ESP8266 softAP hardly to be connected.

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Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of Things applications. We are the manufacturer of ESP8266EX.